|Flight|Date|Payload nickname|Payload|Orbit|Result|
|---|---|---|---|---|---|
|TF1 (Test Flight)|February 4, 1994|Ryūsei|OREX (Orbital Re-entry Experiment)|LEO|Success|
|TF1 (Test Flight)|February 4, 1994|Myōjō|VEP (Vehicle Evaluation Payload)|GTO|Success|
|TF2|August 28, 1994|Kiku 6|ETS-VI (Engineering Test Satellite-VI)|GEO|Success|
|TF3|March 18, 1995|Himawari 5|GMS-5 (Geostationary Meteorological Satellite-5)|GEO|Success|
|TF3|March 18, 1995||SFU (Space Flyer Unit)|LEO|Success|
|F4|August 17, 1996|Midori|ADEOS (Advanced Earth Observing Satellite)|LEO|Success|
|F4|August 17, 1996|Fuji 3|Fuji OSCAR 29, JAS-2|LEO|Success|
|F6|November 27, 1997||TRMM (Tropical Rainfall Measuring Mission)|LEO|Success|
|F6|November 27, 1997|Kiku 7 (Orihime & Hikoboshi)|ETS-VII (Engineering Test Satellite-VII)|LEO|Success|
|F5|February 21, 1998|Kakehashi|COMETS (Communications and Broadcasting Engineering Test Satellites)|GEO|Partial failure|
|F8|November 15, 1999||MTSAT (Multi-functional Transport Satellite)|GEO|Failure|
|F7|Canceled|Midori II|ADEOS-II (Advanced Earth Observing Satellite II)||Canceled|
|F7|Canceled||μ-LabSat||Canceled|

Question: how many years passed between flight tf2 and flight f8?
Answer: 5